Add support for auto-deleting trashed items

Upstream will soon auto-delete trashed items after 30 days, but some people
use the trash as an archive folder, so to avoid unexpected data loss, this
implementation requires the user to explicitly enable auto-deletion.

src/api/mod.rs

@@ -11,6 +11,7 @@ use serde_json::Value;
 pub use crate::api::{
     admin::routes as admin_routes,
     core::purge_sends,
+    core::purge_trashed_ciphers,
     core::routes as core_routes,
     icons::routes as icons_routes,
     identity::routes as identity_routes,